NEWS
a solution for hardware and firmware developers. The wireless ultra-low-power IoT Bluetooth board has advanced hardware- based security features, which is important for IoT applications that detect and analyse movement patterns or health-related data. For example, the Arm Dual Cortex M-Core System on Chip provides a secure M0+ core, physically separated from the user application, which in turn operates on an M4 core. In addition, the MCU provides secure elementary functions for authentication, for example, by means of the Secure Boot function for example, which ensures that only the user’s own authorised firmware is executed to achieve the greatest possible security against manipulation. In addition, cryptographic signing enables protected firmware updates and protected areas can be defined for each executable environment or memory areas.
The wireless data transmission via Bluetooth Low Energy also guarantees extremely low power consumption, which is crucial for integration into a complex IoT system for permanent monitoring and analysis of environmental data.
Best fit for customised requirements
The RAB2 provides easy access to two state- of-the-art CO2 sensors and addresses the development of applications where CO2, relative humidity, and temperature measurements are required. This provides the opportunity to use just one board in the
pre-development phase to evaluate which sensor is most suitable for the setting in question, or whether, if necessary, both can be used for different tasks. This significantly shortens the time to market. If the developer has to deal with two different boards from different manufacturers, this will not only increase the time required but also the risk of impairing the electromagnetic compatibility (EMC) and thus the reliable functionality of the system.
This sensor data is able to provide additional information, for example to determine how many people are currently in a room.
“
At the centre of the board are the PASCO2V01 CO2 sensors from Infineon and the SCD41-D from Sensirion. They are both based on the principle of photoacoustic spectroscopy (PAS), which requires no minimum distance between the radiation source and the sensor. The accuracy of the SCD41-D’s CO2 measurement is ±40 ppm, with a wide measurement range of 400 to 5000 ppm and a response time (63 %) of 60 s. In addition, with an average current consumption of 3000 uA, it is very efficient and insensitive to external loads. With a measuring accuracy of ±30 ppm ±3 % of the measured value, a measuring range of
”
400 ppm to 5000 ppm, the PASCO2V01 also demonstrates extreme compactness. The goal that is desired to be achieved determines which of the two sensors represents the best-fit solution. Among other things, the sensors differ in terms of their inertia in the measurement process. If a medium-term average value is required, as in the case of outdoor CO2 measurement, it is possible that the decision will be made in favour of the sensor with higher inertia. The reason for this is that here the average plays the more decisive role and less the quick detection of one-off peaks. When measuring indoors, on the other hand, it may make more sense to look for low inertia to be able to make decisions and take measures as quickly as possible.
Databased greening of inner cities Furthermore, an area-wide equipment with CO2 sensors is a decisive step for the evaluation of short, medium, and long-term goals and measures for the improvement of air quality in urban areas. If these were used for urban planning purposes, implementations could be more targeted and faster, as well as cost sensitive. Instead of slow-growing individual trees, green houses, such as high-rise buildings with green outer walls, could be built in areas particularly frequented by vehicles. These regulate the temperature in inner cities and are at the same time a natural CO2 filter, whilst also creating a habitat for insects.
8 FEBRUARY 2024 | ELECTRONICS FOR ENGINEERS
▲
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54
